Example of getting system info

[CmdletBinding()]Param(
    [Parameter( Position                        = 0,
                Mandatory                       = $false,
                ValueFromPipeline               = $true,
                ValueFromPipelineByPropertyName = $true
                )]
        [String[]]$ComputerName = 'localhost'
)

begin{
    $remoteQueue = New-Object System.Collections.ArrayList
    $wmiQueue = New-Object System.Collections.ArrayList

    foreach($computer in $ComputerName){
        try{
            Test-WSMan -ComputerName $computer -ErrorAction STOP | Out-Null
        }
        catch{
            Write-Verbose -Message ('Using WMI: {0}' -f $computer)
            [void]$wmiQueue.Add($computer)
            continue
        }

        Write-Verbose -Message ('Using Remoting: {0}' -f $computer)
        [void]$remoteQueue.Add($computer)
    }

}

process{
    if($remoteQueue.count -gt 0){

        $localWMI = {
            $wmiParam = @{
                ComputerName    = 'localhost'
                ErrorAction     = 'STOP'
            }

            try{
                $wmiSystem      = Get-WmiObject -Class Win32_ComputerSystem @wmiParam
                $wmiMemory      = Get-WmiObject -Class Win32_PhysicalMemory @wmiParam
                $wmiProcessor   = Get-WmiObject -Class Win32_Processor @wmiParam
                $wmiSysInfo     = Get-WmiObject -Class MS_SystemInformation -Namespace root\wmi @wmiParam
                $wmiLDisk       = Get-WmiObject -Class Win32_LogicalDisk -Filter "DeviceID='C:'" @wmiParam
                $wmiEnclosure   = Get-WmiObject -Class Win32_SystemEnclosure @wmiParam
                $wmiNetwork     = Get-WmiObject -Class Win32_NetworkAdapterConfiguration -Filter IPEnabled=TRUE @wmiParam
            }
            catch{
                Write-Warning -Message ('Unable to collect WMI data for {0}: {1}' -f $env:ComputerName,$_.exception.message)
                return
            }

            $wmiData = New-Object -TypeName PSObject -Property @{
                ComputerName    = $wmiSystem.Name
                Manufacturer    = $wmiSystem.Manufacturer
                Model           = $wmiSystem.Model
                ProductNumber   = $wmiSysInfo.SystemSKU
                SerialNumber    = $wmiEnclosure.SerialNumber
                Processor       = $wmiProcessor | foreach { $_.name }
                Memory          = [Math]::Round((($wmiMemory | Measure-Object -Property Capacity -Sum).sum/1gb),2)
                HDD             = [Math]::Round((($wmiLDisk | Measure-Object -Property Size -Sum).sum/1gb),2)
                IPAddresses     = $wmiNetwork | foreach { $_.IPAddress }
            }

            Write-Output $wmiData
        }

        Invoke-Command -ComputerName $remoteQueue -ScriptBlock $localWMI | Select-Object ComputerName,Manufacturer,Model,ProductNumber,SerialNumber,Processor,Memory,HDD,IPAddresses
    }

    foreach ($computer in $wmiQueue){
        $wmiParam = @{
            ComputerName    = $computer
            ErrorAction     = 'STOP'
        }

        try{
            $wmiSystem      = Get-WmiObject -Class Win32_ComputerSystem @wmiParam
            $wmiMemory      = Get-WmiObject -Class Win32_PhysicalMemory @wmiParam
            $wmiProcessor   = Get-WmiObject -Class Win32_Processor @wmiParam
            $wmiSysInfo     = Get-WmiObject -Class MS_SystemInformation -Namespace root\wmi @wmiParam
            $wmiLDisk       = Get-WmiObject -Class Win32_LogicalDisk -Filter "DeviceID='C:'" @wmiParam
            $wmiEnclosure   = Get-WmiObject -Class Win32_SystemEnclosure @wmiParam
            $wmiNetwork     = Get-WmiObject -Class Win32_NetworkAdapterConfiguration -Filter IPEnabled=TRUE @wmiParam
        }
        catch{
            Write-Warning -Message ('Unable to collect WMI data for {0}: {1}' -f $computer,$_.exception.message)
            continue
        }

        $wmiData = New-Object -TypeName PSObject -Property @{
            ComputerName    = $wmiSystem.Name
            Manufacturer    = $wmiSystem.Manufacturer
            Model           = $wmiSystem.Model
            ProductNumber   = $wmiSysInfo.SystemSKU
            SerialNumber    = $wmiEnclosure.SerialNumber
            Processor       = $wmiProcessor | foreach { $_.name }
            Memory          = [Math]::Round((($wmiMemory | Measure-Object -Property Capacity -Sum).sum/1gb),2)
            HDD             = [Math]::Round((($wmiLDisk | Measure-Object -Property Size -Sum).sum/1gb),2)
            IPAddresses     = $wmiNetwork | foreach { $_.IPAddress }
        }

        Write-Output $wmiData | Select-Object ComputerName,Manufacturer,Model,ProductNumber,SerialNumber,Processor,Memory,HDD,IPAddresses
    }
}